507 video aspect ratio incorrect


Standard Member
i'm having an issue with my setup, that only occurred with the addition of the 507.
basically, the aspect ratio is sometimes incorrect when i power on the system (ie: the system sets to a 4:3 ratio, when it should be 16:9).

my kit:
Panasonic th-42pz80 tv
onkyo TX-SR507
windows7 MC - running from radeon HD.
harmony 555 Remote controlling all the above

hdmi connections:
Media center <> HDMI <> onkyo 507 <> HDMI <> TV

is there a certain order i need to turn things on, so it detects correctly? i've tried a few different methods, but all have proven incorrect and i keep experiencing the aspect ratio issue.
the fix is to turn the amp off, and turn it back on again which isnt really ideal.

edit: i've just checked the harmony config, the amp is set to turn on last.

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